Electric signal bell



March 4, 1930.v F. ALBRIGHT ET AL 1,749,176

ELECTRIC SIGNAL BELL Filed 1:55.14, 1926 Mu 1AM [LS/{$5287 films ATTORNEY "Patented- Mar. 1930 FRANK, ALBRIGHT, or BRONX, AND WILLIAM nnsnssnlnyor BROOKLYN, New YORK, PArTERsoN, 1vo.,..oF NEW YORK, n. Y., A, GORIPORATION ASSIGNORS 'ro STANLEY & or NEW YORK N omen,

nLnoTRIosIGnAL. BELL Application filed December 14,1926. Serial No. 154,845.

-- .Plunger type electric vibrating bells, to

.- which the present invention belongs and g which are operable on "alternating electricr cluded in this class of electric translating decurrent circuits, are mainly favored on ac- 'ffi count of their economic current consumption.

They have no open contacts and are used :where inflammable gasesor dust exclude the use of other types ofelectric signal bells or, at least, make the same less desirable. v

The present invention, while primarily invices, has for its particular objectthe con- 'struction and organization of parts, to pro 'duce a device of a high: degree of efiiciency and reliability of operation, in which the rate of vibration of the plunger or striker can beso adjusted that the acoustic effect of a bell, gong or other resonant body, though ii-produ'ced, by the mu p strokes the -zo l nis very similar to that of a sing stroke bell and, therefore, fully adapted for 'code signaling, as now used in I alarm telegraph systems. 1

. The particular means bringing about this peculiaractuation of the plunger include resilient means, in partcarried by the arma- Y t'ure of ,the electromagnet, and in-part by s the plunger itself,land cooperating with an adjustable stop, and areinstrumental in ad .justing the operation of the degree of nicetydevice to a high 'The drawing shows insFig. 1, a plan view,

in .Fig- 2, a verticalcro'ss sectionalview and, in part, an elevat onfof the device, and 1n Fig. 3, a perspective vlew'of the armature of the electromagnet.

' A baseor frame carries an electromag 7 'netll, adapted to beenergi'zed by alternatingfcurrent and having a,preferably, laminated core 12 The open pole ends of core 12 abut the front faceof a pivoted armature 13, having cylindrical or other bearings-14 allel tothe ront face of the armature, but

and, when magnet llis energized, attract armature 13.' This armature is'provided with ablade sprin 24 arrangedsubstantially parpre ferably secured to 'the rear face thereof at-or neargthefaxis of movement and extending'beyond'the loweredge of armature 13.

5 Blade spring 24 contacts with the end of modern fire v 24; and coiled spring'26 of 7 I forces armature 13 more or less-into the field "of armature 13, and

axisof movement, but substantially at right angles to the face of armature 13 and extend mg rearward from its face where it is capable of engagement with adjustable stop screw 29, providedon the frame ofthe device. This stop is mainly intended for regulating the movement-of: armature 13, by varying the distance between its front face and the pole endsof core 12. .This stop, when adjusted, also varies the relation between. blade spring plunger and of attraction of magnet 11," for the purpose of further influencing the rate of movement of plunger 25. I a @The bell operates as a vibratory bell in which thestriker continues to strike the bell as long as the circuitcloser is closed, the latter being usually located at a remote point and maybe a simple closing switch or-the the power of the stroke movable contact points operated by the codewheel of a signal transmitter such asused in fire alarm 'telegraphy or, other similar signal transmitters. ,1 f a f I I, Whenthe circuit is closed, the armature is attracted and released by the magnet acco'rding to the cycle of alternationof the operab ing'current and'as long as the circuit is kept closed; The characteristic chattering of the armatureinan alternatlng current magnet 1s, 1n the presentinvention, augmented by-the springs Qetand 26 that at each attraction of the, armature the resiliency of the full length of spring, 24 is operative in resisting the attraction whereby spring 24 is bent and partially separated from armature 13, its resilience, therefore, greater, whileat'each release of armature 13, the resiliency of spring 24 is operative only along that portion of its length extending beyond the armature and,

therefore, less. 7 lhe vibrations of armature ing plunger are, therefore, blade springs 13 and spring 2 L having sufiicient amplitude at the endof spring24c .to cause the striker 25 to effectively strike bell 27 at each alternation of current. This efifect is clearly due to thelocationof spring24c on the off side or Irearfface of armature 13'.

" It will be seen that when magnet 11 is energized' and armature 1-3 is attracted that blade spring 28 separates from stop screw 29. Blade spring 24, contacting with plunger 25, compresses helical spring 26 and forces coacting with said" frame in moving said armature away from said magnet.

In witness whereof, we have ointly signed 7 the foregoing specification, at New York,-in

the county FRANK ALBRIGI-IT.

. WILLIAM ELSASSEB,

plunger 25' to strike gong 27. The elements 1 controlling the movement of the reciprocat- -24, 26.and 28., It is obvious that resilient means of other than blade shape may. be employed inplace of spring 28, such as helical 7 wire or telescoping coils.

" Though only spring 28, is directly engaged by stop screw 29, this single means isqadapted to adjust the tension of the entire resilient system, comprising in this preferred form,

all three springs 24, 26 and 28, and thereby v V controlling theef'uciency of the "whole signal device. 1 p

v M er in theop 'oositedirection.

2. In combi ation, an electromagnet operating on alternating current, a pivoted armature,*a plunger, resilient means substantially parallel to the plane, and securedto the rear face and near the pivot, of'said, armature and adapted to contact with one end of said plunger for moving said plunger in one "direction, a second'resillent meanssubstantlally atrlght cured-to the latter near the pivot for causing;

angles to the plane of said armatureand'sethe first named resilient means to bear against the plunger, and resilient means on said I plunger for cushioning the stroke of said contacting means means,

In combination, a frame, an'el'ec'tromagnot, an armature, a striker, a'translating devicecooperatlng with said striker, means on the rear face of said armature resiliently 00- I operating with said striker, the resiliency of 7 said means being greater when said armature is moving toward said magnet than when andiaiding said "retracting moving-away from said magnet, means on x said "armature resillently coactlng with said frame in moving said armature toward said magnet; and means on said striker resiliently and State of New York, this 10th day of'December, 1926. V

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